Mail delivery failed: returning message to sender

This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
2052251066@tmomail.net
host d79033a.ess.barracudanetworks.com [64.235.153.2]
SMTP error from remote mail server after end of data:
550 permanent failure for one or more recipients (2052251066@tmomail.net:550 Sender IP reverse lookup rejected)

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